Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details 2)

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Fair Value Measurements (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) $ 16,300 $ 46,096 $ 16,300 $ 41,260
Exit costs on property dispositions     186 4,066
Fair value measurement on a nonrecurring basis | Discontinued Operations
        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries)     14,800  
Exit costs on property dispositions     186  
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
        
Assets and liabilities measured at fair value on a non-recurring basis        
Exit costs on property dispositions 186   186  
Properties Expected to be Conveyed | Fair value measurement on a nonrecurring basis
        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) 10,400      
Other Properties with Shortened Holding Periods | Fair value measurement on a nonrecurring basis
        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) 5,900      
Number of Properties, Shortened Holding Period 2      
Properties,net | Fair value measurement on a nonrecurring basis
        
Assets and liabilities measured at fair value on a non-recurring basis        
Impairment losses (recoveries) 21,888 [1],[2] 52,900 [1],[3] 30,940 [1],[2] 60,593 [1],[3]
Properties,net | Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
        
Assets and liabilities measured at fair value on a non-recurring basis        
Assets 245,535 [1],[4] 369,312 [1],[4] 245,535 [1],[4] 369,312 [1],[4]
Exit costs on property dispositions   2,900   4,200
Properties,net | Fair value measurement on a nonrecurring basis | Total Estimated Fair Value
        
Assets and liabilities measured at fair value on a non-recurring basis        
Assets $ 245,535 [1] $ 369,312 [1] $ 245,535 [1] $ 369,312 [1]
[1] Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[2] Represents impairment losses, excluding exit costs incurred of $186,000 for the three months and nine months ended September 30, 2013.
[3] Represents impairment losses, excluding exit costs incurred of $2.9 million for the three months ended September 30, 2012 and $4.2 million for the nine months ended September 30, 2012.
[4] These fair value measurements were developed as a result of negotiations between us and potential, or actual, purchasers of properties.